Attachment of safety shield to a powder actuated tool



Feb. 17, 1959 n.1'. cATLlN ETAL 2,873,446

ATTACHMENT OF SAFETY SHIELD TO A POWDER ACTUATED TOOL Filed DeC. 16, 1955 III INVENTORS ROBE/97 7 CATL//V Al? THU/Q J. ANDA i plate 121 United States:4 Patent ATTACHMENT oF SAFETY SHIELD To A POWDER ACTUATED TooL Robert T. Catlin, Trumbull, and Arthur J. Landa, Huntington, Conn., assignors to Remington Arms Company, Inc., Bridgeport, Conn., a corporation of Delaware Application December 16, 1955, Serial No. 553,475

6 Claims. (Cl. 1-44.5)

This invention relates to powder actuated tools, and contemplates a novel means for attaching guard assemblies to such tools in a way which enables the ready removal and replacement of such guard assemblies.

A popular type of powder actuated tool is designed to drive hard metal studs into ditlicultly penetrable materials such as aged concrete and steel and by so doing to enable the securing of other workpieces to such structural materials. The tools are adapted to many uses under widely varying conditions, and a variety of guards are provided for adapting the tools to particular situations. Such guards frequently serve the dual purpose of stopping fragments which may be dislodged from the structure and properly positioning one or more elements to be secured to the structure. It thus becomes desirable to attach the guard assemblies to the tool in a manner which enables their ready removal and replacement. A device for this purpose is provided by the present invention.

ln the drawings:

Fig. l is a fragmentary vertical longitudinal section showing a typical box guard assembly and as much of a stud driving tool as is necessary to show the attachment of the guard thereto.

Fig. 2 is a transverse section, substantially on the line 2-2 of Fig. 1.

Fig. 3 is a view similar to Fig. 2, showing the attaching device in a position which enables the removal of the guard assembly.

The invention is illustrated and will be described as applied to a stud driving tool of the type shown in the pending application of Walker et al., S. N. 517,192, tiled June 22, 1955, but it will be understood that it is applicable to other tools.

` The tool comprises a barrel partially housed within a frame comprising a frame plate 11 to which the barrel is suitably secured as by a threaded joint and a generally cylindrical frame body 12 comprising an end which is apertured to receive the barrel and guard assembly.

The guard assembly comprises a barrel sleeve or guide tube 13 which surrounds the barrel 10 and is slidable thereon. Suitably mounted on guide tube 13 is a guard member 14 of such configuration and characteristics as to adapt it to the particular work to be done. The drawings show by way of illustration only a simple square box guard. The'drawings further show the guard as having a limited movement lengthwise of the guide tube, but this also is immaterial.

The guide tube 13 extends through an aperture in the front end 121 of the frame body 12 and within the frame may comprise a section 131 of increased diameter terminating in an end section 132 of reduced diameter, the junction of parts 131 and 132 forming an annular shoulder serving as an abutment for an action plate identified generally by numeral 15, which plate is apertured to be received on the reduced diameter end ,ice

132." The action plate 15 is thrust forwardly against'the shoulder by suitable means such as one or more springs 16 `carried on spring pilots 17 which, as described in v the aforementioned application of Walker et al., may also serve as bolts joining the frame body 12 to frame plate 11. There may be secured to action plate 15 a rearwardly extending rod or action bar 1.8 ,having a fire control function, as described n said application. The action plate 15 is therefore normally resiliently held m position in frame body 12 between the lower ends of' springs 16 and the inwardly turned ange 125 forming the partial bottom closure of the frame body. As shown in Figure 1, however, with the gun held in operative relationship against the work surface, the frame 12 is displaced downwardly relative to the guide tube 13 and action plate 15 to the position shown, against the action of springs 16.

The readily disconnectable means for joining guide tube 13 to action plate 15, contemplated by this invention, is constructed as follows:

The margin of action plate 15 comprises an annular groove 151 adapted to receive a resilient connecting element identified generally by numeral 19. Opposite action plate groove 151 is a groove 133 in the end section 132 of guide tube 13. The resilient element is so biased that it normally occupies portions of both groove 133 and groove 151, thereby joining the guard assembly to the action plate. To enable the displacement of the joining element completely into groove 151, thereby releasing the guide tube 13, said element is provided with radially outwardly extending legs 191, which legs embrace a cam 20 secured to a short arbor 21 which ex tends through the end plate 121 of the frame and outside this plate has secured thereto a ngerpiece 22. The rearward portion of action plate 15 is radially slotted through from the guide tube receiving aperture, to enable the movement of legs 191 requisite to remove the resilient member 19 completely into groove 151, the margins of the slot being shown at 152 (Fig, 2). The forward part of the action plate comprises a cut-out bounded by surface 153, to enable movement of the cam. Fig. 3 shows the parts in disconnect position.

As described in the aforementioned. application of Walker et al., the guard assembly and action plate must be positioned rearwardly with respect to barrel and frame to enable tiring. Cam 20 is made of such length as to be embraced by legs 191 in any relative position of frame and guard assembly.4

What is claimed is:

1. in a powder actuated tool comprising a frame, a barrel secured thereto and a guard assembly for the muzzle end of said barrel, a detachable connection for said guard assembly comprising a member supported on said frame, said member and said guard assembly comprising counterpart annular recesses, a resilient element biased to normally occupy portions of both of said recesses, thereby joining said guard assembly and said member, and a manipulative device engaging said resilient element and enabling the displacement of said ele* ment into one of said recesses.

2. A tool according to claim l, in which said resilient element comprises an arcuate body and end portions extending substantially radially outward from said arcuate body.

3. A tool according to claim 2, in which said manipulative device comprises a cam disposed between'the terminal portion of said resilient element, and a ngerpiece positioned to actuate said cam.

4. A tool according to claim 3, in which said cam and lingerpiece are secured to an arbor disposed substantially parallel to the axis of said barrel.

within said frame,` said arbor extends through said frameand said ngerpiece is outside said frame and adjacent thereto.

6. A tool according to claim 5, in whichv said member is'supported for movement of said frame relative to said member and said cam is of sufficient length to remain operatively` engaged with said resilient element in all positions of said frame in normal operation of the tool.

References Cited inthe le of this patent UNITED STATES PATENTS 239,827. Newman Apr. 5, 1881 Smith Apr. 27, 1948 Bumiller Jan. 24, 1956 Phillips Apr. 10, 1956 FOREIGN PATENTS Austria Oct. 10, 1955 Belgium Aug. 14, 1952 France July 6, 1955 

